Checking The Starter Motor Operation; Checking The Stator Coil - Yamaha YZF-R125 Service Manual

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Lean angle sensor output voltage
Less than 65°: 0.4–1.4 V
More than 65°: 3.7–4.4 V
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a. Connect the lean angle sensor to the wire
harness.
b. Connect the pocket tester (DC 20 V) to the
lean angle sensor coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
yellow/green "1"
• Negative tester probe →
gray/black "2"
c. Set the main switch to "ON".
d. Tilt the lean angle sensor to 65°.
e. Measure the lean angle sensor output volt-
age.
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EAS28940
CHECKING THE STARTER MOTOR
OPERATION
1. Check:
• Starter motor operation
Does not operate → Perform the electric
starting system troubleshooting, starting with
step 4.
Refer to "TROUBLESHOOTING" on page
8-9.
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a. Connect the positive battery terminal "1" and
starter motor lead "2" with a jumper lead "3".
EWA13810
WARNING
• A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
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ELECTRICAL COMPONENTS
• This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
MMM
b. Check the starter motor operation.
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EAS28150

CHECKING THE STATOR COIL

1. Disconnect:
• Stator coil coupler
(from the wire harness)
2. Check:
• Stator coil resistance
Out of specification → Replace the crank-
shaft position sensor/stator assembly.
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a. Connect the pocket tester (Ω × 1) to the stator
coil coupler as shown.
LLL
• Positive tester probe →
white "1"
• Negative tester probe →
white "2"
• Positive tester probe →
white "1"
• Negative tester probe →
white "3"
MMM
• Positive tester probe →
white "2"
• Negative tester probe →
white "3"
8-70
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Stator coil resistance
0.32–0.48 Ω at 20 °C (68 °F)
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Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
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